| 摘要 |
The pin (1) has a mono bloc structure with a shaped conical base (14) secured in the root canal and head (4) securing the false tooth or cast. The circumference groove (6) is closer to the top end (8) of the pin (1) than the projection (7), with the longitudinal groove (15) running between projection (7) and groove (6). The entry and release surfaces (9,10) have shallow angle of contact with the tooth.
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